Electric headlight lamp



Sept. 7 1-926. 1,598,687

T. c. MJCQLLUM ET AL ELECTRI C HEADLI GHT LAMP Filed July 28 1925 g'nveutou n m d C m a 7 Patented Sept. 7,1926.

UNITEIL STATES PATENT OFFICE.

Tno As c. MecoLLuM AND JAMES H. n'oennns, or BIRMINGHAM, ALABAMA.

- ELECTRIC HEADLIGHT LAMP.

Application filed July, 28, 1925, Serial No. 46,640.

This invention relates to an improved electric lamp especially designed for use 1n connection with automobile headlights and seeks, among other objects, to provide a lamp wherein the intensity of the light will be increased while, at the same time, headlight glare will be eliminated.

The invention seeks, as a further object, to provide a lamp embodying a mirror arranged to screen the lamp filament from direct observation and disposed to reflect the light rays downwardly toward the bottom of the headlight reflector whence the rays will be projected forwardly in a substantially horizontal beam.

, And the invention .s e as a still further object, to provide, a lam fwhich may be readily manufactured an which maybe used in connection with ordinary existing headlights. I

Other objects of the invention not above specifically mentionedwill appear as the description proceeds.

In theaccompanying drawings:

Figure 1 is a sectional view showin our improved lamp installed in a conventional motor vehicle headlight. H

F'gur'e 2 is a detail side elevation of the lamp, partly broken away and shown in section to illustrate the mounting of the mirror.

Figure-3 is a'transverse sectional view on the line 3-3 of Figure '2, looking in the direction indicated by the arrows.

In accordance with the present invention, the lamp is formed'with a base 10 of approved construction and connected at, its

smaller endwith the base in the usual mannor is a substantiallyungular bulb 11 preferably' of clear glass. In other wor s, the

bulb is'of 'frusto conical. shape, but the .base' is tilted toward the base 10 and the mirror is preferably formed of a' separate flat glass disc provided at its inner side with a silver coating. 14. As brought out in Figure 2, said disc fits within the larger end of the bulb and is preferably fused atits peripherlyq therewith, although said disc may be ot erwise hermetically connected with the bulb. Thus, the mirror may be. separately formed and'later assembled with the bulb,

and since the silver coating 14 is disposed mounted within the shell is a parabo' '0 reflector 16 carrying a socketl7, while afront lens 18 closes thereflector at its lar er end.

As will be observed, the base 10 of t e lamp is engaged in the socket 17 and the lamp is so. disposed that the mirror 13 is tilted vertically and rearwardly with respect to the reflector 16. Accordingly, light rays emanating from the filament 12 and striking" the mirror will, as suggested in dotted lines,

be reflected downwardly b the mirror against the lower portion or the reflector, w

en said rays-will be again reflected forwardly in a substantially horizontal beam. By disposing the mirror at the proper angle with respect to the filamentgthe greater portion of the light rays ma be thus reflected downwardly and .forwar y so that the light will shield the filament from direct view and thus eliminate the lare which wol ld otherwise be experience v 0 Having thus described the invention, what we claim-is:

1. The combination with a motor vehicle headlight having a reflector, of a lam mounted axially of the reflector and inclu ing an ungular bulb, a filament disposed axially of the bulb, and a mirror closing the larger end of the bulb infront of the filament and inclined with respect to the axis of the bulb for reflecting light rays'emanating from the filament downwardly against the lower portion ofsaid reflector.

2. In an electric lamp, the combination of a base, a frusto conical bulb connected at -will. be ooncentrated in a beam of intense 'brilliancy. At. the same time, the mirror its smaller end with the base, the base of reflecting downwardly the light rays emathe bulb being inclined with respect to the mating from the filament.

axis of the bulb, a filament'supported ax- In testimony whereof we aifix our signaially of the bulb, and a fiatdisc closing the tures.

larger end of the bulb and silvered. at its inner side to form a mirror disposed in in- THOMAS C. MGCOLLUM. [11.3.].

olined position in front of the filament for JAMES HUGHENS. [1,. 3.] 

